<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
	</body>
	<script>
		var a={age:12};
		var b=a;
		a={name:"Bob",age:13 }
		b.age=14;
		console.log(b.age,a.name ,a.age)//14 Bob 13
		function fn(obj){
			obj={age:15}
		}
		fn(a)
		console.log(a.age)//13
		
	</script>
	
</html>
